I do appreciate these replies -- pictures to come once this old girl is delivered. I may post one of the seller's pictures but they mostly were victim of camera flash and focus fuzziness. The model closest by catalogue description and line drawings is Modello 403 Stella. I like the fact it seems to have about 29 inch barrels, I like 30 inch best for swing balance. This one is said to lock up tight and looks pretty good (in fuzzy pictures...) for a 1949 gun.
Sidelock hammerguns sure are a slice of different and beyond the Elmer Fudd look, I think they have an unusual appeal. We shall see...
Cheers,
FM